Manufacture of relief-engraved printing cylinders



April 29, 1924.

E. T. NEBEN MANUFACTURE OF RELIEI'EINGRAVED- PRINTING CYLINDERS FiledMay 13. 1921 'r l u /wvvv w/ w M m Fla 4 'durability yaccording to theuse madeof the printingcylinder.y

torender theprinting face true andreven.

means for applying a molten metalbacking .n fr... 1.1"

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` MANUFACTURE OF RELIEF-ENGRAVED'PRINTING CYLINDERS.

`Application filed may 13,

To all whom-.it may concern: n

Be it known that I, EMIL T. NEBEN, a citizen of the ,United States, `anda resident of Ridgewood, in the county of Bergen and State of NewJersey, have invented new and useful Improvements in the Manufacture ofRelief-Engraved Printing `Cylinders, of which the following is a full,clear, and eXact description. j

The invention `relates to molds for casting peripherally closed reliefengraved printing cylinders, such as shown yand described in the LettersPatent of the United States, No. A1,261,642,granted to me VJApril 1918.6i The-fobjectof, thelpresent invention is to 4provirdelcertain new and,useful improve- .ments-in'the' manufactureof relief engraved printing,cylinders `whereby. `the printing cylinder` .Y is4 rendered absolutely.true 4and even, and practically freefof imperfections at the 'printingface to insure'the subsequent making` of perfect impressions when used*in the art of continuousk rotary printing.

AAnother objectV is to permit .they manufaci ture, of relief engravedprinting cylinders in an exceedingly economical .manner and to allow of`varying the: thickness `of the metal A of the printing cylinder fon.`strength and In order to produce the desired result, ,the inventionconsists essentially ink lirst pro- .,ducingl; an electrotypeplatefmbending the same into'a cylinder with `the printing faceydisposed exteriorly, placingv the/printing cylinder into a` mold havinga highly polished L.interior surface, then subjecting the interiorsurface ,offthe printing cylinder to ahammering action t forcethefprinting face of the .cylinder into intimate contact withithepolished innerfsurface of the mold g-The invention `,also consists inysuitableto the inner` surface of the printing cylinder tof-give@By-desired thicknessfto 'the metal i921-, serial Nojfieaieo.

describedand then specifically pointed .outy

in the claims. Y

A practical embodiment of the invention is represented yin theaccompanying drawings forming a part of this specification, in whichsimilar characters of reference 'indicate ycorresponding parts in allthe views.

VFigure 1 is a face view ofthe electroplate;

Figure 2 an outline view of the apparatus for bending the electroplateinto cylindrical shape; s y

Figure Slis an ,end view of the printing cylinder with ythe contactingside edges soldered together;

Fv'gure tis a similar view ofthe printing cylinder e,within ,they moldto be hammered'into true and even shape;l .Figure 5 is anenlargedsectional side elekvation oftheapparatus for providing the printingcylinder with" a backingg' y Figure 6 'is a sectional plan view ofthesame on `the line 6-6 of Figure 5; and

Figure y7- is a reduced end` view ofy the finished printing cylinder. nI In order l to .produce thenrelief engraved printing cylinder, Iproceed jin detail as follows:` L pen and ink,` or awash yjdrawing isiirstrnazle `and matched on all sides'fwhen y curvefdf 'on a woodenroll'. `From 'thiszdrawinglis `made ay negative `in line or 'half-tone'andlprinted on' Zinc or copper and etched in "the usualv manner. `Aplate thusjprepared "ferme an original stocky plate `froni which is madean electrotype 10,A shown in Figure.1j, lhaving a raised. printingsurface 11. j The; electr'opla*tev 10 is placed between two protectingmembers 12 and '13 and is then passed ,throughk a bending machine havingthree cylinders .14, v15 and 16 to bend the electroplate intoaperipherally closed relief Aengraved printingl cylinder 20,v shownv inFigure. Theabutting edgesofthecylinder20jare soldered together leitherthrough- 'outfy'the lengthv of theV joint ,or in several places tomaintainV the shapey of thecylinder.

lThe l cylinder f '20"*isA next placed [into a inold 121 havinganexceedingly highly v"polished finteriorfsurfaceu[against which yabutsthe printing face' 11of the cylinder 20. The 'interior surface of they.printing cylinder 20 is 4new subjected toa hammering action, Apreferably v.bytheuse of anjelectric hammer,

to "forcev v intofintimate vet.

contact with the polished 'inner :surface "of the moldk 21 to renderthe'printing face true and even. n

The printing' cylinder 20, after'being removed from the mold 21, isplaced-into a v'mold 30 with theprinting face v11 in Contact withythe'interior surface ofthis mold 30.

The mold is made in sections 31 connected with each other by hinges32'to` permitof convenientlyopening and closing the. mold. Alockingde'vice 33 of any approvedtconfv struction iS usedto lholchthesections 3l lockedfwhen inclosed position.v Within the 'mold 3()andwspaced rfrom the .innerjsuriace of the 'printinglcylinderBD is atubular core 35 made in sections 36 havingl overlapping ksidesy37V toallow the sections 316 of the core 35 to expand and contract, as will bereadily understood.by'ireerence to Figurew. v.The

inner ,surface-of eachclorefsection vis pro vided with a number 'ofvertically spaced wedges40-each having a dovetail 'groove 4l into whichtits a. correspondinglyyshaped v tongue 42 ofa wedge 43 securedto'amandrel 44,- .p-referably of tubular l shape, .f and heldcentrally-'withinthe vcore It will be noticed thaty by the arrangementdescribed vth'elpairs ofi wedges40fand 43..coactwith each other toexpand or contract the sections 36 of the core '35 lon moving themandrel 44 upward or downward. The loweropen .endy of lthe mandrel 44 tsontoa guide pin 45 engaging at itsv lower yend a central opening 46"formed inarbottomor base plate47 v closingthe lowerend,` of the moldl30 and the core35f( The guide pin 45 is provided with .azcolla'r 48seatedonfthe upperl surface of y jthe bottom 47ste support the pin 45rin Vertical position .and centrally withinl the mold 30. The 4upperportion of the' mandrel 44- is`provided with ascrew thread50 in which.;screws a screw rod 5l having la smoothupper portion 52 mounted to turnin Qa loearing53 arranged-within the upper end of the vcore 35. Thescrewrod 51 is provided with acollar 54 supporting the bear-r ing 53,rand a retaining collar -55 is attached tothe'smooth portion 52 andisseated on the top ofthe bearing 53.' The upperend y530i ythe smoothportion 52- of the screw rodlis made polygonal for the application of awrenchwor otherftoolto. permit of turningtheScrew rod 45,1with a view tomove the l mandrel44up ordown yaccording tothel directionin which thescrewfrodfl is turned. Thus when the screw rod 51-is turned in onedirection the mandrel 44 is raisedand the" .ffpairsrot wedges 43.407movethesections 36 6ov ,l l n 4 v 43,:40 movethe sections 36 of the core 35outn ,.ward.,I Thus by the: arrangement described. the'space 60between`the`core'35 andtheinofthe-core "35 inward, and on Vmoving themandrel 44 down-ward thepairs of wedges ner surface of the printingcylinder 20 can bel increased and diminished endl es this space isfilledwith molten metal for forming a backing for the printing cylinder2() it is evident that the backing will be of more or less thickness.The bearing 53 is provided with projections--65 preferably in the formof the heads of screws screwed to the bear-y ing 53, the "saidprojections'l 65 yengaging openings 66 formed in the correspondingsecthepipes 7,0 are connected by a pipe 71`with t a" vessel containing lthe'moltenv metal for forming the backing vfor the printingcylinderf'20. .Therorey 35 'is preferably :prof-l' tected by a covering75 of-pressboard'. A closing ring 76 isl seated on the top `lovf"thecore 35. and the top of the, printingjcylinder 2O to 4closepth'e upperendofthe'fspace 60 to preventwthe discharge "of molten metal from `thespace .60` at this'endl'- From' the foregoing it will be seen that theapparatus for providing the printingA cylinder QOfwith a backing can bereadily opened and closed for the insertion and removal Vof thefprintingcylinder, and the sections 36 of the core 3 5 can be readily. adjusted'inward oroutward-y to provide the printing cylinder/20` with a backing74y otl a desired thickness Ringff76 may be providedfwithone or moresuitable vents to permit the air, to escapefas the/inoltenmetal enters.,c v n f Having `,thus describedl my inventiomI I claim aswnew .anddesire'to` secure yby Letters Patent: A y f I i 1. In an apparatus'forproducing a 'relief engraved printing cylinderg'a sectional tubularouter kmold adapted to hold'the printing-cylinder with the printingfaciel thereof in contact with the innerzsurfac'e -of the mold, a'Vsectional tubularcore-*within `the t, said mold and spaced from theprinting cyl-v inder, manually controlled means 'extending throughthe'centerofsaidcore rand Inovable longitudinally thereof for'eXpanding orcontracting/the sections ofthe 1said-core to vary the space between thevcore and the 'printing cylinder, yand means forpassing the molten metalinto the space between the core and the printing cylinder tofprovideabackingy for thelatter.

2. 4In anapparatus n engraved print-ingcylinder, a *sectional tubular'outer mold adapted to hold. a 'printing ycylinder with" the*printingV face thereof in contact lwith, the inner surface'"of` v they'm'.old, a" sectional tubular core 'within the said mold spacedtherefrom, .a mandrel. movable fory producing a relief f longitudinallyand centrally within the said core, coacting pairs of wedges on the saidmandrel and core to expand or contract the same, and means -for passinga molten metal into the space between the core and the printing cylinderto provide a backing for the latter.

3. In an apparatus for producing a relief engraved printing Cylinder, anouter cylinder within which the engraved printing cylinder is placed, asectional core arranged within the printing cylinder, a mandrel withinsaid sectional core, and means on the mandrel and the sections of thecore for moving said sections to or Jfrom the inner face of saidprinting cylinder.

4. In an apparatus of the class described, an outer casing adapted toreceive a print-l ing plate, a core placed within said printing plate,means movable longitudinally of said core for expanding or contractingsaid core so as to permit a space between the inner face o said plateand said core, and means for passing molten metal in said space forproviding a backing for said printing plate.

5. In an apparatus for producing a relief engraved printing plate, anouter cylinder within which the engraved printing plate is placed, theface of the printing plate bearing against the inner face of saidcylinder, Va core extending within said cylinder at spaced relation withthe rear face of the printing plate, means extending within said corefor contracting or expanding said core so as to increase or decrease thespace between the c ore and the plate, means connected at the end ofsaid cylinder for passing molten `metal into said space so as to providea reinforcing backing for said plate, means at the opposite end of saidcylinder so as tov form a closure for said space between the core andthe plate to prevent the molten metal from escaping through that end ofthe cylinder.

EMIL T. NEBEN.

